Look at my painting. It is of a farmhouse on the crest of a hill as the sun is going down. There is a dirt road. I didn’t paint it brown. It is blue. I didn’t paint the fields on either side green, just a deeper shade or value of blue. This tricks your eyes into thinking it is in shadow. The shadow side of the house is a light blue tint.
Now look to see where the sin is glowing. It is yellow. The side of the house with sunlight has a yellow tint. I have left the sky white because the strong sunlight overtakes the blue in the evening. The clouds are just some blots of bluish brown. The tree limbs look lit up. They are painted an orange shade which gives them the illusion of being illuminated by the sun.